what's the meaning of Expired Promo ?

I have one instance in New Jersey which is $2.50/month ，but i reveived a billing in 2018-06-14 4:00 which pay $5.20，and it's description is Expired Promo (Used:19.80 of 25.00)” what's that mean ? will it pay next month?

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Limited time promo credits generally have an expiration date which is listed on the checkout page when sign up and on your billing statement. Any unused portion of the promotional credit will expire on this date.